SU800981A1 - Method of protecting continuous-pulsed voltage stabilizer from overcurrent with continuous and pulsed control circuits - Google Patents

Description

(54) METHOD OF PROTECTION OF CONTINUOUS-PULSE VOLTAGE STABILIZER FROM OVERLOADS ON CURRENT WITH CONTINUOUS AND PULSE CONTROL PANELS

probability of failure of the control transistor of the continuous control loop as a result of overcurrent. In case of overcurrent or short circuit of the voltage regulator, the signal for removing the overload removes the power from the pulse control loop, after which the increasing overload current or short circuit KopoTKOtO flows through the regulating transistor of the continuous control loop during the delay time of the power supply of the continuous control loop. During this time, an overload power is released on the collector of the control transistor of the 1-pulse control circuit, which can exceed the nominal power by a factor of ten, since the continuous control circuit stabilizes an insignificant part of the voltage regulator power.

As a result of instantaneous overheating of the collector junction due to an excess of dissipated power, the regulating transistor of the continuous control loop may fail.

The purpose of the invention is to increase reliability by eliminating the overload on the current of the control transistor which is continuous regulation when the stabilizer is overloaded.

The goal is achieved by simultaneously removing power from the continuous and pulsed control circuits and turning on the regulating transistor of the pulsed C regulating circuit with the generated signal to remove the overload.

The drawing is a block diagram of a device that implements the proposed method of protection.

The device contains a continuous control circuit 1 with a current sensor 2 and a regulating transistor 3 of the sequential type, a pulse control circuit 4 with an overload current sensor 5, a regulating transistor 6, a switching diode 7, a cumulative inductance 8, a threshold device 9 with switches 10 and 11, a circuit 12 controlling the control transistor 6 and the load 13.

At rated load, the threshold device 9 is turned off and the power supply circuits of circuits 1 and 4 of the pulse and continuous control are closed through switches 10 and 11. When the current overload or short circuit when the current load 13 exceeds the allowable value, the threshold device 9 operates. In this case, the switch 10 turns off the power of the continuous control circuit 1, the switch 11 turns off the power of the loop 4, and through the control circuit 12 turns on the regulating transistor 6 of the loop 4 of the pulse control. The control transistor 6 remains in a saturated state until the threshold device 9 is turned off by an external operator command.

Turning off the power and turning on the regulating transistor of the loop 4 of the pulse control, formed by the overload removal signal, eliminates overvoltages at the junctions of the regulating transistor 6. The switching emission of the EMF of the self-induction of the accumulative inductance 8 through the low resistance of the junction collector-open emitter transistor 6 is applied to high resistance open switch 11. After opening the switching diode 7, the accumulated inductance energy 8 is discharged to the load 13.

The proposed method for disconnecting the power supply of the continuous-pulse regulator control circuits in case of overload. Over current or short-circuit to the output of the stabilizer (simultaneous disconnection of the power of the continuous and pulse control circuits and turning on the control transistor of the pulse control circuit by the formed signal for removing the overload) allows to obtain a new set of features advantageously distinguish the proposed method of exclusion from the known one, since, along with the protection of the regulating element that the pulse control circuit from overcurrents and overvoltages is protected effectively against pulse overcurrent continuously regulating transistor control circuit, thereby significantly increases the reliability of continuous-switching regulator. The technical and economic effect of applying the method of protection lies in the fact that the stabilizer of continuous-pulse regulation with the protection according to the proposed method does not fail in the event of any fault in the load. Consequently, the stabilizer repair is not required, the recovery time of the systems powered by the stabilizer is reduced, which is especially important during the operation of complex systems, since a power failure leads to the failure of the entire system.

Claims (1)

Invention Formula The method of protection of a continuous-pulse voltage regulator against current overloads with continuous and pulse control circuits by detecting the load current of the stabilizer in the pulse control loop, comparing it with a predetermined allowable load current, generating a signal for removing the overload and turning off the power supply of the pulse circuit control, characterized in that, in order to increase reliability by eliminating the current overload of the control transistor of the continuous control loop when The current regulator simultaneously removes power from the continuous and pulse control circuits and turns on the regulating transistor of the pulse control loop with the generated signal to remove the overload. Sources of information taken 30 attention in the examination 1. Sources of electrical power on semiconductor devices. Design and calculation. Ed. S.D. Dodika and E.I. Halperin. M., Sovradio, 1969, p. 346. 2, USSR Copyright Certificate No. 542987 cl. G05 F 1/58, 1975. R